how can we afford this tax? ...big corporations and the richest two percent. >> what's at stake is the future of america. >> it costs us, and taxes us, too much. >> american future fund is responsible for the content of this advertising. >> ryssdal: i knew right away this wasn't going to be the usual story on campaign finance. one of the first surprises was finding myself driving the dark streets of denver with attorney alan schwartz, who shared kind of a strange experience. >> it was early january of 2011, and my wife, who had just been reelected to the colorado state senate, got an e-mail from someone who claimed to have some information about a group that had sent out some attack ads against my wife. >> ryssdal: the guy said he had some documents, and a week later... >> i heard from this individual again. still not identifying himself, but telling me that if i wanted to see the documents, then i needed to get them that day. >> ryssdal: had to be that day. >> had to be that day. >> ryssdal: schwartz agreed to